Abstract: The bi-directional DC/DC converter has zero voltage switching (ZVS) soft switching capability resulting in a higher efficiency, and provides reduction of the switching losses due to higher switching frequencies. The capability of operation in higher frequencies results in reducing the size of passive components including inductance and capacitors. The subject DC/DC converter is capable of operating with three voltage levels in both power flow directions, thus providing flexibility in the voltage control and attaining lower inductor current ripple and lower switch voltage ratings. DC link capacitors are replaced with ultra capacitor banks split in two.

Abstract: Systems and methods are provided for a transformerless power supply configured to limit heat generation. A system includes a power supply input configured to receive power from a time-varying input voltage source. A phase control circuit is configured to generate a current control signal, where the current control signal commands power to be drawn from the power supply through an output transistor, where the current control signal commands the drawn power to have a minimum current when the time-varying input voltage is at a maximum, and where the current control signal commands the drawn power to have a maximum current when the time-varying input voltage is at a minimum. A power supply output is responsive to the output transistor, where the power supply output is configured to output power drawn from the power supply input via the output transistor, wherein the outputted power is at a consistent power level.

Abstract: Generally, this disclosure provides circuits and methods to reduce and regulate DC link voltage in a power supply through the use of a DC breaker circuit. The breaker circuit may include a breaker switch configured to couple an input stage circuit of a power supply to an output stage circuit of the power supply and to provide a regulated DC link voltage to the output stage circuit, the level of the DC link voltage based on switching states of the breaker switch. The breaker circuit may further include a control circuit configured to generate a gate control signal to control the switching states of the breaker switch, the gate control signal based on a comparison of the DC link voltage to a high voltage threshold and a low voltage threshold, such that the magnitude of the DC link voltage is regulated to a set point and a peak-to-peak ripple.

Abstract: A control circuit of a power converter and a method therefore are provided. The control circuit comprises an input circuit, an amplifier, a PWM circuit, and a power management circuit. The input circuit is coupled to a transformer to generate a sensing signal related to an output voltage of the power converter. The amplifier generates a feedback signal according to the sensing signal and a reference signal. The PWM circuit generates a switching signal according to the feedback signal for switching the transformer and regulating the output voltage of the power converter. The power management circuit controls the reference signal according to the feedback signal. The power management circuit includes a timer for determining a period, and the output voltage of the power converter decreases while an output power of the power converter is lower than a light-load threshold. A method for controlling the control circuit is also disclosed.

Abstract: A buck converting controller, adapted to control a DC-DC buck converting circuit to convert an input voltage into an output voltage, is disclosed. The buck converting controller comprises a feedback control circuit, an off-time determination circuit and a load control circuit. The feedback control circuit turns on and off a high-side transistor and a low-side transistor of the DC-DC buck converting circuit in response to a feedback signal indicative of the output voltage. The off-time determination circuit determines a preset off-time period according to the input voltage and the output voltage and generates an off notice signal according to the preset off-time period. The load control circuit is coupled to the DC-DC buck converting circuit and determines whether to release an electronic energy stored in the DC-DC buck converting circuit according to the off notice signal.

Abstract: A method and apparatus for converting direct current into alternating current. The direct current is converted into a number of alternating currents using a switch system. The number of alternating currents is filtered using a set of inductors and a set of capacitors. Higher-frequency electromagnetic interference is blocked using a choke located between the set of inductors and the set of capacitors.

Abstract: A multi-level inverter includes two N-level inverter units with pulse width modulation waves staggered by a phase of 180 degrees, and N is an integer greater than or equal to 3; a direct current power source module, where an output end thereof is connected to input ends of the two N-level inverter units; a transformer, where the transformer includes a primary side and a secondary side, an inductor of the primary side and an inductor of the secondary side are coupled, and one end of the inductor of the primary side and one end of the inductor of the secondary side are connected to output ends of the two N-level inverter units respectively. The two N-level inverter units are reversely coupled, and the other end of the inductor of the primary side and the other end of the inductor of the secondary side are connected.

Abstract: A controller for a power converter includes an edge detection circuit and a drive circuit. The edge detection circuit includes a comparator, a count module, and an edge checking module. The comparator is coupled to output a compare signal in response to comparing an input sense signal and a count signal. The input sense signal is representative of an input voltage of the power converter. The count module is coupled to adjust the count signal to track the input sense signal in response to receiving the compare signal. The edge checking module is coupled to output at least one edge signal in response to the compare signal. The drive circuit is coupled to output a drive signal in response to the at least one edge signal. The drive signal is for controlling a switch coupled to regulate an output of the power converter.

Abstract: In one embodiment, a circuit includes a first transistor having a control terminal, a first terminal, and a second terminal where the first transistor is a first device type. The control terminal of the first transistor receives an input signal. The circuit also includes a second transistor having a control terminal, a first terminal, and a second terminal where the second transistor is a second device type. The control terminal of the second transistor is coupled to the second terminal of the first transistor. A voltage shift circuit has an input coupled to the first terminal of the first transistor and an output coupled to the first terminal of the second transistor and a voltage between the input of the voltage shift circuit and an output of the voltage shift circuit increases as a current from the output of the voltage shift circuit increases.

Abstract: Provided is a highly-efficient switching power-supply device having a wide input voltage range. The switching power-supply device includes: a first series circuit including first and second switching elements and a second series circuit including third and fourth switching elements, which are connected in parallel with a power supply; a series resonance circuit including a primary coil and a capacitor connected in parallel with the second switching element; a reactor connected between a connection point of the third and fourth switching elements and the capacitor; a transformer having the primary coil and a secondary coil; and a control circuit that turns on-and-off the first and second switching elements, alternately, and turns on-and-off the third and fourth switching elements, alternately. The control circuit switches the first and second series circuits when an input voltage is low and switches only the first series circuit when the input voltage is high.

Abstract: Embodiments of the present invention disclose a power supply conversion apparatus, where a control unit generates a corresponding control signal according to a received high level pulse width modulation signal, to control a first PMOS transistor Q3, a second PMOS transistor Q4, and a second NMOS transistor Q2 to be turned off successively, and then to make a first NMOS transistor Q1 conducted, which makes a voltage at a second end of a bootstrap capacitor to rise from ground potential to a PVDD, so that a voltage at a first end of the bootstrap capacitor rises to a PVDD+AVDD as the voltage at the second end rises, and a gate turn-on voltage of the first NMOS transistor Q1 reaches the PVDD+AVDD.

Abstract: A voltage regulator including a first, second, and third capacitances, first switches, and second switches. A first terminal of the first capacitance is connected to a first output. The first output is at a first output voltage. A first terminal of the second capacitance is connected to a second output. The second output is at a second output voltage. The first switches connect a first terminal of the third capacitance to a voltage supply, the first output, or the second output. The second switches connect a second terminal of the third capacitance to a reference terminal, the first output, or the second output. The first and second switches are controlled, based on the first output voltage and the second output voltage, to: adjust voltages across the first, second, and third capacitances; maintain the first output at a first predetermined voltage; and maintain the second output at a second predetermined voltage.

Abstract: When an AC voltage is outputted to an inductive load, pulsation of an effective power caused by an odd number-th order harmonic component of a current flowing in this load is reduced. A modulation factor k of an inverter 4 includes a DC component k0 and an AC component. The AC component includes a frequency which is a 6n multiple of the fundamental frequency of AC voltages outputted from the inverter. Even when there are not only the 5th order harmonic component of load currents but also the 7th order harmonic component, it is possible to adequately set the ratio of the magnitude of the AC component and the ratio of the DC component and reduce pulsation of consumption power caused by these harmonic components. Reducing the pulsation contributes to suppression of power harmonics.

Abstract: A buck-boost converter comprising: a voltage source; an inductor, wherein a first terminal of the inductor is switchably connected to the voltage source; and a plurality of capacitors switchably connected to a second terminal of the inductor, wherein a respective plurality of output voltages are formed across the plurality of capacitors, further comprising: an error determination means, for determining an error in each of the plurality of voltages, an inner control loop adapted to switchably connect one of the plurality of capacitors to the second terminal of the inductor in dependence on the determined errors; and an outer control loop adapted to control switching between buck mode and boost mode in dependence upon the determined errors.

Abstract: An electronic circuit includes a failure detection circuit that detects an abnormality of the gate potential of a transistor of a bridge circuit. The failure detection circuit monitors an output voltage of a drive circuit that is to be the gate potential of the transistor of the bridge circuit and, when detecting an abnormality, stops the drive circuit.

Abstract: A voltage converting device includes a feedback module, for generating a comparing signal according to a feedback voltage and a reference voltage; a pulse-width-modulation module, for generating a driving signal according to comparing signal; a voltage-converting module including a low-side switch for controlling a connection between a node and ground according to driving signal, a high-side switch for controlling a connection between the node and an output end according to a control signal, an inductor coupled between the node and an input end, a feedback-voltage-generating unit for generating feedback voltage according to an output voltage of output end and a ratio, an adaptive current-generating unit for generating a current signal according to an adjusting signal, and a control unit for selecting driving signal or current signal as the control signal according to output voltage and an input voltage; and a current-adjusting module for generating adjusting signal according to comparing signal.

Abstract: An adaptive AC power exchanger generates stable 120 VAC 60 Hz power from variable grid input power nominally at 220 VAC and 50 Hz. The exchanger includes an AC-DC circuit stage coupled to receive the input AC current and generate a VDC output, and a DC-AC circuit stage to generate power for a load. The AC-DC stage includes an EMI filter and surge protection circuit, a 50 Hz rectifier and a power factor correction (PFC) circuit controlled by a PFC controller to yield a 400 VDC output coupled through a bulk capacitor stack to a common connection to generate a 200 VDC voltage node. The 200 VDC and 400 VDC voltages are coupled to the DC-AC circuit including a pulse width modulator; current load limiter; an LC filter having a capacitor, dual inductors and an inductor by-pass relay; and a load disconnect relay all controlled by an AC bridge controller.

Abstract: A device for detecting an average output current of a power converter includes a current generation unit, a first voltage generation unit, a first current mirror unit, and a second current mirror unit. The current generation unit generates a first charge current according to an intermediate voltage. The first voltage generation unit generates a first node voltage according to the first charge current, a first discharge current, a turning-on time, and an inverse turning-on time. The first current mirror unit generates a first current according to the first node voltage, and generates a second voltage corresponding to the average output current of a secondary side of the power converter according to the first current. The second current mirror unit generates the first discharge current according to the first current.

Abstract: The power supply apparatus includes a transformer having a primary and secondary sides, a first line and a second line to which an AC voltage is input from an AC power supply, a rectifying and smoothing unit that rectifies and smoothes the AC voltage, a shut-off unit provided between the first line and the rectifying and smoothing unit, a switching element that switches a current from the rectifying and smoothing unit to the primary side of the transformer, a first overvoltage detection unit that outputs a voltage corresponding to the AC voltage, a second overvoltage detection unit that outputs an overvoltage detection signal; and a control unit that controls the shut-off unit to shut off the input of the AC voltage.

Abstract: A voltage regulator apparatus and an associated method are provided, where the voltage regulator apparatus includes: a voltage regulator module for regulating an input voltage according to a bandgap reference voltage to generate an output voltage; and a plurality of sensing modules. Ina situation where the output voltage abruptly decreases, a sensing module reduces, based on a variation amount of the output voltage, a decrement of the output voltage. In a situation where the output voltage abruptly increases, another sensing module reduces, based on another variation amount of the output voltage, an increment of the output voltage. In addition, yet another sensing module senses variation of the output voltage, converts the variation of the output voltage into a current signal, and applies the current signal to a control terminal within the voltage regulator module to indirectly control the output voltage.